Extensible shaft-coupling.



K R. s. KING. EXTENSIBLB SHAFT COUPLING.

APPLIUATION FILED' JULY 22. 1907.

Patented Apr. 18, 1909.

ooooooooqoonvoo@ n@ INVENTOR,

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A TTORNE Y.

.for a pneumatic drill,

UNITED sTArns PATENT OFFICE,

l"ROBERT S. KING. OF VALLEJO, CALIFORNIA.

, EXTEN SIB LE SHAFT-COUPLIN G.

Application filed July '22,

To ollqwhom it may concern.' Be 1t known that l, ROBERT S. KING, a citizen of the United States, residing at Vallejo, in the county of Solano and State of California, have invented new and useful lmprovements in Extensible Shaft-Couplings" of which the following is a specification.

The object. of Athe present invention is to provide an extensible shaft couplingada'pted for various uses, and particularly )r a feed drill can be adjusted work than heretofore. I

ln the vaccompanying drawing, Figure 1 is .to a greater range of f a side view ota pneumatic drill having my .extensible feed applied thereto broken longitudinal .V section -on ,anA enlar ed scale of the extension vand portions of the drill and feeder attached. thereto; Fig. 3 is a top plan Viewy of the inner-tube detached; Fig. 4 is cross section on the line. 4 4 of Fig. 2;-Fig. 5 is across section on the line 5`5of Fig. Q j

' Referring to "thefdrawing, 1 indicates pneumatic drill offcomnion construction, and :Zthe usual feeder'for said drills. 3 indicates an extension which, as clearly shown in Fig.

,Fig 2 is a '2, 4comprises fin-inner tube 4,'and an outer tube 5 slidableupon theziinner tube. The inner-tube 4 hasat one end Va threaded plug precisely similar-to the plug 7 of the feeder 2 and adapted in place of said plug to be screwed into the socket 8 of the'pncumatic drill, and the outer member 5 has at the other end a socketv 9 precisely similar to the socket 8, and adaptedto receive the threaded 7 of thefeeder 2. ,Said outelmember 5 can be moved longitudinally upon the inner member 4, and, to secure it in any one of a lseries of positions thereon, there are formed in the inner member a longitudinal series of holes 1,0, and adapted to engage any one of these' ioles is a stoppin 12 carried .on the end of a lever'13 pivoted on a scrcwfpost 14,

member, the other ltravel in the line Specification of Letters Patent.

by means 'of which the 'Patented April 13, 1909.

1907. Scria1N0.,385,077. v

into which extendV balls 18 contained in a circular channel .19 formed by inner 'and outer collar sections 20, 21, screwed together, as more clearly shown in Figs, 2 and 4. This permits the outer tube 'to move freely upon the inner tube longitudinally, ,but without turning thereon.

BecauseA the ,groovesll' are closed at the ends, and the balls are contained in apertures 'in the'tube 5, said balls form locking keys reventing .the withdrawal of the vtube 5 romthe tube '4. Moreover, the collar sections.' 20,' 21, canbe rotated freely upon the tube 5, and' thereby each ball can be caused to rotate u on an axisl parallel with the eX- -tension his v prevents the ball running always on the same part and prevents undue wear upon any one part, so that the ball wears uniformly.

pneumatic drill to be used for a much greater range of work than with devices of this class heretofore employed, 'while at the same timeit is'readily" and quickly adjustable topermit the drill to be placed at'the best advantage j lor the work to be done.

claim I 1. An extension device comprising two membersl telescoping one on the other, the inner member being vformed with longitudinal grooves, balls in the respective grooves, 'the outer member beingv apertured to receive the respective balls, and a vloose collar on the ,outei' member. having a circular channel for tho outer portions o` all the balls, substantially as '-described.

2. n extension device comprismg two members telescoping'one on`the other, the inner member being formed nal grooves, balls in the respective grooves, the outer member being ,apertured to receive the respective balls, and inner. and outer collar sections screwed together, each formed with a circular recess, which when the secwitnesses. I

ROBERT S. KING. Witnesses;

J. H. HER-BERT, W. L. KING.

It is obvious that this device enables -av with longitudij 

